Local structural distortions in SnTe investigated by EXAFS

Extended x-ray absorption fine structure (EXAFS) has been measured at the K edge of Sn in SnTe in the temperature range from 5 to 480 K. EXAFS results are consistent with the presence of a local rhombohedral distortion in the full temperature range from 5 to 300 K, even well above the ferroelectric...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2021-06, Vol.33 (29), p.295404
Main Authors: Fornasini, P, Grisenti, R, Dapiaggi, M, Agostini, G
Format: Article
Language:English
Subjects:
EXAFS
ferroelectric transition
local distortions
tin telluride
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Summary:Extended x-ray absorption fine structure (EXAFS) has been measured at the K edge of Sn in SnTe in the temperature range from 5 to 480 K. EXAFS results are consistent with the presence of a local rhombohedral distortion in the full temperature range from 5 to 300 K, even well above the ferroelectric transition temperature, suggesting a partial order-disorder character of the transition. At and above 300 K, the anomalous behaviour of the third and fourth EXAFS cumulants reveals a modification of the anharmonicity of the effective pair potential, possibly connected with the softening of high frequency modes or to the presence of multiple phases.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/ac0082